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There's no such thing as porn addiction, a psychologist in New Mexico concluded after reviewing academic literature on the subject.

"The theory and research behind 'pornography addiction' is hindered by poor experimental designs, limited methodological rigor, and lack of model specification," clinical psychologist David Ley wrote in the journal Current Sexual Health Reports.

"Since a large, lucrative industry has promised treatments for pornography addiction despite this poor evidence, scientific psychologists are called to declare the emperor (treatment industry) has no clothes (supporting evidence)."

In reviewing academic material on porn addiction, he found that only 37% of articles actually labelled it as such and just 27% of articles on the subject contained actual data.

He also said researchers have found little evidence "if any at all" of porn addiction's "purported" negative side-effects, such as erectile dysfunction, brain changes, or behavioural problems.

"We need better methods to help people who struggle with the high frequency use of visual sexual stimuli, without pathologizing them or their use thereof," Ley wrote.